The problem with leaderless uprisings taking over is that you don't always know what you get at the other end. If you are not careful you could replace a bad government with one much worse!
Once a novel gets going and I know it is viable, I don't then worry about plot or themes. These things will come in almost automatically because the characters are now pulling the story.
When a tradition gathers enough strength to go on for centuries, you don't just turn it off one day.
The last four or five hundred years of European contact with Africa produced a body of literature that presented Africa in a very bad light and Africans in very lurid terms. The reason for this had to do with the need to justify the slave trade and slavery.